Rebooted to my normal mode and the USM update config file hang continued so I ran your script from viewtopic.php?f=75&t=3040&p=24697#p24697 and it ran to completion successfully. I will try a USM GUI Update tomorrow to confirm things work again.

And while I am happy to finally get this resolved it's frustrating trying to figure out what I did that caused the problem. Solving problems is great but knowing how to prevent them from happening again is even better.

Interesting to see that the config file update only happens after the first database update and not all of them.